Kanayama Seiki FA-4A-M2 Oil Flow Alarm Unit

Kanayama Seiki FA-4A-M2 Oil Flow Alarm Unit

The Kanayama Seiki FA-4A-M2 is an electromechanical oil flow alarm unit designed to monitor critical fluid pathways in marine propulsion engines, auxiliary diesel generator lube loops, reduction gears, and industrial hydraulic systems. Manufactured in Japan under stringent engineering standards, the FA-4A-M2 provides immediate, fail-safe contact switching in the event of lube oil depletion, bypass conditions, or flow-rate drop below safe operational thresholds.

Built with a robust cast-aluminum enclosure and precision-machined internal mechanical sensing components, the FA-4A-M2 operates reliably in harsh marine environments characterized by continuous low-frequency vibrations, wide thermal excursions, and heavy oil contamination.

Model Details

• Manufacturer: Kanayama Seiki Co., Ltd. (Japan)
• Model: FA-4A-M2
• Part Number / MPN: FA-4A-M2
• Related Model Variants: FA-4A-MMD, FA-4A-MM5D, FA-4A
• Cross-Reference Brands: Shimadzu Seisakusho FA-4A-M2 / FA-4A-MMD

Technical Details

Key Features

1. High-Integrity Electromechanical Switching: Provides rapid-action, dry contact actuation triggered by fluid dynamic displacement without relying on external DC excitation.
2. Marine-Grade Cast Housing: Built with a vibration-dampened, corrosion-resistant cast alloy housing sealed to withstand engine-room airborne aerosols and high humidity.
3. High Electrical Rating Capacity: Heavy-duty internal terminal block rated up to 600V / 20A, allowing direct routing into high-voltage safety trips or shipboard Alarm Monitoring Systems (AMS).
4. Zero Low-Flow Blindness: Mechanical differential mechanism eliminates false resets caused by turbulence and fluctuating engine RPM.
5. Direct Drop-In Interoperability: Standardized 4-pole screw-compression terminal layout conforming to standard Japanese marine engine automation topologies.

Applications

• Marine Main Propulsion Engines: Cylinder lubrication pipelines, camshaft oil lines, and turbocharger gravity/booster feed lines on MAN B&W, WinGD, Sulzer, and Yanmar engines.
• Auxiliary Diesel Generator Engines: Sump oil return lines and circulating lube circuits to prevent bottom-end bearing seizure.
• Stern Tube & Gearbox Lubrication: Continuous-delivery verification for shaft line white-metal bearings and reduction gear meshing sprays.
• Industrial High-Pressure Hydraulic Power Packs: Pump casing flush circuits and heavy press hydraulic fluid circulation loops.
• Centrifugal Oil Separator Systems: Purifier and clarifier seal-water and sludge flush oil flow validation.

Compatible Machinery & Platforms

• Engines: Mitsubishi UE / UEC series, Yanmar 6EY/8EY series, Daihatsu DK/DC series, Sulzer RND/RLB/RTA series.
• Separators & Centrifuges: Alfa Laval, Mitsubishi Kakoki Kaisha (MKK) SJ series.
• Deck & Automation Machinery: IHI deck cranes, steering gear power units, and hydraulic windlass power units.

Direct Cross-Reference & Equivalent Part Numbers

• Shimadzu Seisakusho: FA-4A-M2, FA-4A-MMD
• Kanayama Seiki Co.: FA-4A, FA-4A-MM5D, FA-4A-M2D
• OEM Stock Reference: BZH167831 / FKM14204

Frequently Asked Questions

What is the functional difference between the Kanayama Seiki FA-4A-M2 and the FA-4A-MMD?

Both share the identical fluid sensing block, mounting pitch, and core contact ratings. The variation suffix (M2 vs. MMD) designates specific internal spring rates for adjusted oil viscosity ranges and specific external electrical connector/conduit gland threading standards utilized by different Japanese shipyards.

How do I configure the terminals for a failsafe engine shutdown system?

To ensure failsafe operation, wire the trip circuit through the normally closed (NC) contacts (Terminals 1 & 2) in series with the safety loop. If a cable break occurs, or if fluid flow drops below the trip setpoint, the circuit interrupts instantly, commanding the automation system to issue a shutdown or alarm.

Can the FA-4A-M2 unit monitor fuels such as MDO and low-sulfur gas oil?

Yes. The internal mechanical sensing components and viton/elastomeric seals are fully compatible with distillate fuels, light marine diesel oils (MDO/MGO), and viscous heavy lubricants (SAE 30, 40, and 50).

What causes intermittent alarm flickering when the engine is running at full sea speed?

Intermittent tripping at steady running RPM is typically caused by air ingestion in the lubrication loop, upstream cavitation from a worn gear pump, or electrical contact chatter triggered by engine frame resonance. Check line pressure with an analog pressure gauge and tighten the internal terminal damping screws.

Does the FA-4A-M2 require an external power supply to trigger alarms?

No. The FA-4A-M2 is an electromechanical switch. It operates entirely on fluid dynamics and mechanically activates dry contacts. It only requires the control circuit voltage (up to 600V AC/DC) that runs through its switching loop to interface with your monitoring panel.